with the new firmware update, line 6 provided new knobs for the amps. bias, bias x, etc... What exactly do these do? i have left all at 12 oclock position but if moved, i dont hear a noticable change in character. if this can be explained i would be very greatful. as an engineer my occ kicks in if i dont know what something does or how it works. thanks in advance.
If you search this forum you will find several threads that have discussed this topic. They should give you the information you want. Here's one:
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